An electric power system of a flying object may supply power to electric loads including a VTOL motor and a cruise motor. A control device includes an acquisition unit, a determination unit that determines whether a power surplus situation in which surplus power obtained by deducting the required power from the sum of the generated power and the regenerated power is larger than the maximum allowable power is brought about, and a control unit that can execute power consumption increase control for increasing power consumption by reducing the operation efficiency of the cruise motor in the power surplus situation.